Cytogenetic analysis and fluorescence in situ hybridization (FISH) confirmed the diagnosis of CML-CP by the presence of translocation t(9; 22)(q34; q11) in 20 out of 20 metaphases without additional abnormalities and a positive p210 BCR::ABL1 transcript. The gene discussed is ABL1; the disease is chronic myelogenous leukemia, BCR-ABL1 positive.